Your 3rd picture is Auluctinia verrucosa as explained above, but see also http://www.aquariofilia.net/forum/index.php?showtopic=189998 ,& scroll down about 6 pages to answer #6 showing an A.v. exactly alike (but underwater), & next pic of #6 even shows the same pair of bright pink 'highlights' near the mouth; & scrolling down to answer #8 an underwater pic of Actinia fragacea (your 1st 2 pics)